Composite profile and producing method thereof

Abstract

A wood-fiber aluminum-plastic composite profile and a producing method thereof is provided. The profile comprises: an inner core made from minerals, plant fibers, additive and a type of waste plastic, and a protective film layer on the outer surface of the inner core made from a type of plastic identical to that of the inner core. The producing method comprises: adding raw material in weight ratio with main material of 30-55%, supplement material of 38-55%, filler of 5-30%, and additive of 2-6% in a mixer, processing into particles, and co-extruding the inner core and the protective film layer synchronously. The profile produced by the method has good quality, long service life, high durability and wide application range.

Description

[0001]This nonprovisional application is a continuation of International Application No. PCT / CN2012 / 073379, which was filed on Mar. 31, 2012, and which claims priority to Chinese Patent Application No. CN 201120392316.1, which was filed on Oct. 14, 2011, and to Chinese Patent Application No. CN 201110313088.9, which was filed on Oct. 14, 2011, and which are all herein incorporated by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to a wood-fiber aluminum-plastic composite profile and a producing method thereof, and in particular, to a wood-fiber aluminum-plastic composite profile produced with waste starting materials and a producing method thereof.[0004]2. Description of the Background Art[0005]An aluminum-plastic composite profile produced with waste plastics according to the prior art is produced as follows: mixing waste plastics, minerals, plant fibers, additives and other starting materials according to a ratio for hot me...

AI Technical Summary

Benefits of technology

The present invention proposes a method to attach a protective film layer to the surface of an inner core using a co-extruding process. This method can be used with different types of plastic resins, but the inner core and the protective film layer must choose the same plastic type for the process to be effective. This provides a more robust and reliable attachment of the protective film layer to the inner core.

Problems solved by technology

However, such a type of profiles has some drawbacks: (1) As they are made by compounding starting materials, such as minerals, plant fibers, and additives, with waste plastics, rather than by a single plastic starting material, the profiles have loose texture, poor air-tightness, tiny holes all over the surface, poor waterproofness, poor resistance to elements, poor resistance to wind, sunlight and rain, no resistance to moisture and sudden temperature change, tendency to develop mould in the presence of moisture, and short service life; (2) As they are made by compounding starting materials, such as minerals, plant fibers, and additives, with waste plastics, rather than by a single plastic starting material, the profiles have rough surface and dull and dark color.

They are not beautiful, and when a decorative layer is attached to the outer surface, it is difficult to find a bonding agent that matches the interface properties due to the poor firmness of the profile surface and because that the interface is not formed by a single starting material.

The bond is not firm and tends to break apart.

However, it has been found through production that this method still has some drawbacks:

The plant fibers may enhance the tensile strength and flexibility, but have high brittleness, low strength, and poor resistance to elements.

They are impacted greatly by sunlight and moisture, have low resistance to aging, and are easy to break.

If PS and LDPE are selected therefrom as starting materials, the product will have problems like decreased strength, shortened service life, the coated aluminum layer tends to delaminate, and the bonding is not firm.

There are a number of apparatuses and complicated processes.

Even with such complicated processes, the inner core (the rough profile obtained in Step 3) and the outer metal aluminum foil layer could be adversely affected since the coating materials are not carefully selected.

With respect to the inner core, since the plastic starting material used in Step 3 is not the same as the plastic starting material used in Step 6, the thermoplastic properties are not consistent and they cannot be bonded by a bonding agent, but can only be hot rolled and ironed with a coating by a rolling machine, which cannot integrate the inner core and the coating material into one piece very well.

This will result in a problem that the current bonding agent is difficult to bond aluminum foil with waste plastics mixed with colors.

Since the coating starting materials are not a single starting material, the material surface has poor density, is coarse and has a lot of micropores, which is difficult to firmly bond with the bonding agent.

It is easy to delaminate, peel off, and generate bubbles, which further affect the integrity and quality of the profile, as well as starting material sorting in another recycle (due to the different melting points of the starting materials), leading to improper recycle and unfavorable for environmental protection.

Moreover, the product is impacted greatly by sunlight and moisture, has low resistance to aging, and is easy to break.

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